[Code of Federal Regulations]
[Title 49, Volume 3]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR192.105]

[Page 39]
 
                        TITLE 49--TRANSPORTATION
 
 CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF 
                       TRANSPORTATION (CONTINUED)
 
PART 192_TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM 
FEDERAL SAFETY STANDARDS--Table of Contents
 
                          Subpart C_Pipe Design
 
Sec. 192.105  Design formula for steel pipe.

    (a) The design pressure for steel pipe is determined in accordance 
with the following formula:

P=(2 St/D)xFxExT

P=Design pressure in pounds per square inch (kPa) gauge.
S=Yield strength in pounds per square inch (kPa) determined in 
accordance with Sec. 192.107.
D=Nominal outside diameter of the pipe in inches (millimeters).
t=Nominal wall thickness of the pipe in inches (millimeters). If this is 
unknown, it is determined in accordance with Sec. 192.109. Additional 
wall thickness required for concurrent external loads in accordance with 
Sec. 192.103 may not be included in computing design pressure.
F=Design factor determined in accordance with Sec. 192.111.
E=Longitudinal joint factor determined in accordance with Sec. 192.113.
T=Temperature derating factor determined in accordance with Sec. 
192.115.

    (b) If steel pipe that has been subjected to cold expansion to meet 
the SMYS is subsequently heated, other than by welding or stress 
relieving as a part of welding, the design pressure is limited to 75 
percent of the pressure determined under paragraph (a) of this section 
if the temperature of the pipe exceeds 900 [deg]F (482 [deg]C) at any 
time or is held above 600 [deg]F (316 [deg]C) for more than 1 hour.

[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-47, 49 FR 7569, 
Mar. 1, 1984; Amdt. 192-85, 63 FR 37502, July 13, 1998]